3D imaging is produced by visual differences between human eyes. The distance between people's eyes (pupils) is usually about 8 cm. In order to let people see 3D images, it is necessary to let the left eye and the right eye see different images, so that there is a certain gap between the two images, which is to simulate the actual situation when the human eye watches. This is how the three-dimensional sense of 3D comes from.
The commercialized 3D projection technologies in cinemas around the world mainly include active stereo and passive stereo. Some companies have also introduced spectral stereo projection technology (INFITEC) using RGB color separation technology. By increasing the picture refresh rate (twice the refresh rate of 2D projection), the projector and the player can play left-eye or right-eye pictures on the same projector. Through the synchronous switching function of LCD glasses, the left and right eyes can see different pictures, resulting in a stereoscopic effect.
Two 2K digital projectors conforming to DCI technical specifications, two digital film servers supporting active stereoscopic projection, two polarizers, high-gain metal screens and ordinary polarized glasses. Two projectors and players are used to play the pictures of the left and right eyes respectively, and polarized light in different directions is provided for the left and right eyes through polarizers and metal screens. When the audience wears polarized glasses, the left and right eyes see different pictures, resulting in a three-dimensional effect.